SQL Server 2005 Versions and Features Comaprisons

http://www.microsoft.com/sql/prodinfo/features/compare-features.mspx

One thing i found missing in the comparison is, that Peer To Peer Transactional Replication used for scaling out is only supported in the Enterprise Edition

SQL Server version Info and Build Details!

To get the version info for the SQL server we use:
select @@version
or
select serverproperty('productversion')

Following are very cool links to get a very detailed information about all builds and versions which fairly helps in maintaining patches and security!

http://sqlsecurity.com/FAQs/SQLServerVersionDatabase/tabid/63/Default.aspx

http://sqlserverbuilds.blogspot.com/

http://support.microsoft.com/kb/321185

SQL Server 2008 (Katmai) download links!

Trial Download:

http://www.microsoft.com/sqlserver/2008/en/us/trial-software.aspx



SQL Server 2008 Feature Pack:

http://www.microsoft.com/downloads/details.aspx?familyid=c6c3e9ef-ba29-4a43-8d69-a2bed18fe73c&displaylang=en&tm

SQL Server 2008 Upgrade Advisor:
http://www.microsoft.com/downloads/details.aspx?FamilyID=F5A6C5E9-4CD9-4E42-A21C-7291E7F0F852&displaylang=en